Anyhoo,... the movie is picture perfect. Thank God for director Joss Wedon (another self proclaimed comic book geek). He hits all the great points from action to comedy. The comedy sections are what makes the movie for me. Sure, the action and effects are incredible, but the light hearted moments that get a roar of laughter from the crowd really lift the movie up past your usual summer effects movie. Love the cast too. So cool to see the characters from their stand-alone movies come together here. Never thought I'd see it, but it sure has paid off.
Couple things I didn't think were quite there. Not a fan of Captain America's costume this time around. Really liked the Bryan Hitch inspired costume from Cap's solo movie last year. That one was more of a soldier uniform and looked bad ass. The updated costume for the Avengers just looks kind of goofy. I'm not sure what they could have done to make it look less so, but maybe more towards a modern soldier uniform with the Cap elements added in. Tough nut to crack.
Also would have been cool to have Antman and Wasp in there as they are founding members, but they may be too fringe for your average moviegoer (although, I understand an "Antman" movie is in the works, so maybe the inevitable sequel).
I'm glad I got to spout some nerd opinion before this thing went to BluRay/DVD. So there you have it.